Does the ground always shake in an earthquake?

Question

The base of the seismograph shakes when the ground shakes from an earthquake, but the hanging weight does not. All the movement is absorbed by the spring or string that is hanging from it. There is a difference between the shaking part of the seismograph and the motionless part.

Hagrid P Hazard · Accepted Answer

The base of the seismograph shakes when the ground shakes from an earthquake, but the hanging weight does not. All the movement is absorbed by the spring or string that is hanging from it. There is a difference between the shaking part of the seismograph and the motionless part.

Does the ground always shake in an earthquake?

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